题目

Once my mother told me a story about the antelope (羚羊) and the lion in Africa. When an antelope wakes up every morning, the first thing it thinks about is, “I must be able to run _______ than the fastest lion, or I’ll be killed.” And the first thing a lion thinks about is, “I must be able to _______ the slowest antelope, or I’ll be hungry.” So, almost at the same time, the antelope and the lion get up and _______ running toward the rising sun.This is life: full of chances and challenges. _______ you’re an antelope or a lion, you must go ahead. For students, it’s just the sa有一段铝导线，把它均匀拉长为原来的2倍，它的电阻将变           ，这是因为                                            的缘故；若将原来的铝导线对折起来使用，它的电阻将变        ，这是因为                                                的缘故．